Effect of Parameters
on the Surface Crown Pillar Stability in an Underground Mine considering Regression
and Artificial Neural Network Models
Mohanto S., Reddy Jeevan M., Shivaraj D., Ramprasad B. and Sripuja D.
Disaster Advances; Vol. 18(5); 76-81;
doi: https://doi.org/10.25303/185da76081; (2025)
Abstract
Natural pillars including surface crown, crown, rib and sill pillars play a vital
role to deal with the instability issues encountered in any underground metal mine.
Therefore, especially in large-scale production methods, these pillars should be
strong enough to endure the generated stresses generated by extraction and blasting.
For the final design, more thorough techniques like numerical modelling must be
utilized; empirical and analytical methods hold viable for the preliminary design.
This study looks into the stability of a 40 m surface crown pillar below the ultimate
open-pit bottom at a copper mine with a steeply dipping orebody.
A total of 54 finite element models have been analyzed for underground mines considering
elastic-constitutive material model. The evaluation of results obtained from simulation
models is carried out using safety factor as a function of variation in material
properties, crown pillar thickness, rib pillar thickness and stope extraction sequence.
It is observed that for the considered geo-mining conditions, the surface crown
pillar is safe for the different parametric variations.
